t = count( $coupon_items );
		$num_updated        = 0;
		$num_deleted        = 0;

		foreach ( $coupon_items as $coupon_item ) {
			$coupon_id = self::get_coupon_id( $coupon_item );
			unset( $existing_items[ $coupon_id ] );

			if ( ! $coupon_id ) {
				// Insert a unique, but obviously invalid ID for this deleted coupon.
				$num_deleted++;
				$coupon_id = -1 * $num_deleted;
			}

			$result = $wpdb->replace(
				self::get_db_table_name(),
				array(
					'order_id'        => $order_id,
					'coupon_id'       => $coupon_id,
					'discount_amount' => $coupon_item->get_discount(),
					'date_created'    => $order->get_date_created( 'edit' )->date( TimeInterval::$sql_datetime_format ),
				),
				array(
					'%d',
					'%d',
					'%f',
					'%s',
				)
			);

			/**
			 * Fires when coupon's reports are updated.
			 *
			 * @param int $coupon_id Coupon ID.
			 * @param int $order_id  Order ID.
			 */
			do_action( 'woocommerce_analytics_update_coupon', $coupon_id, $order_id );

			// Sum the rows affected. Using REPLACE can affect 2 rows if the row already exists.
			$num_updated += 2 === intval( $result ) ? 1 : intval( $result );
		}

		if ( ! empty( $existing_items ) ) {
			$existing_items = array_flip( $existing_items );
			$format         = array_fill( 0, count( $existing_items ), '%d' );
			$format         = implode( ',', $format );
			array_unshift( $existing_items, $order_id );
			$wpdb->query(
				$wpdb->prepare(
					// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
					"DELETE FROM {$table_name} WHERE order_id = %d AND coupon_id in ({$format})",
					$existing_items
				)
			);
		}

		return ( $coupon_items_count === $num_updated );
	}

	/**
	 * Clean coupons data when an order is deleted.
	 *
	 * @param int $order_id Order ID.
	 */
	public static function sync_on_order_delete( $order_id ) {
		global $wpdb;

		$wpdb->delete( self::get_db_table_name(), array( 'order_id' => $order_id ) );
		/**
		 * Fires when coupon's reports are removed from database.
		 *
		 * @param int $coupon_id Coupon ID.
		 * @param int $order_id  Order ID.
		 */
		do_action( 'woocommerce_analytics_delete_coupon', 0, $order_id );

		ReportsCache::invalidate();
	}

	/**
	 * Gets coupons based on the provided arguments.
	 *
	 * @todo Upon core merge, including this in core's `class-wc-coupon-data-store-cpt.php` might make more sense.
	 * @param array $args Array of args to filter the query by. Supports `include`.
	 * @return array Array of results.
	 */
	public function get_coupons( $args ) {
		global $wpdb;
		$query = "SELECT ID, post_title FROM {$wpdb->posts} WHERE post_type='shop_coupon'";

		$included_coupons = $this->get_included_coupons( $args, 'include' );
		if ( ! empty( $included_coupons ) ) {
			$query .= " AND ID IN ({$included_coupons})";
		}

		return $wpdb->get_results( $query ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
	}

	/**
	 * Initialize query objects.
	 */
	protected function initialize_queries() {
		$this->clear_all_clauses();
		$this->subquery = new SqlQuery( $this->context . '_subquery' );
		$this->subquery->add_sql_clause( 'from', self::get_db_table_name() );
		$this->subquery->add_sql_clause( 'group_by', 'coupon_id' );
	}
}